diff --git a/src/views/components/head.html.ecr b/src/views/components/head.html.ecr
index 49d3032..e804d40 100644
--- a/src/views/components/head.html.ecr
+++ b/src/views/components/head.html.ecr
@@ -8,7 +8,7 @@
   <link rel="stylesheet" href="<%= base_url %>css/mango.css" />
   <link rel="icon" href="<%= base_url %>favicon.ico">
 
-  <script src="https://polyfill.io/v3/polyfill.min.js?features=matchMedia%2Cdefault&flags=gated"></script>
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=MutationObserver%2Cdefault%2CmatchMedia&flats=gated"></script>
   <script defer src="<%= base_url %>js/fontawesome.min.js"></script>
   <script defer src="<%= base_url %>js/solid.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>